2024-26423. Air Plan Approval; District of Columbia, Maryland, Virginia; Determination of Attainment by the Attainment Date and Clean Data Determination for the Washington, DC-MD-VA Nonattainment Area for the 2015 Ozone National Ambient Air Quality ...

Table 1—Completeness Data Percentage (%) From 2019 to 2023 for the Washington Area

Location	AQS site ID	2019	2020	2021	2019-2021 Average	2022	2020-2022 Average	2023	2021-2023 Average
District of Columbia	110010041	100	98	98	99	95	97	98	97
District of Columbia	110010043	98	99	99	99	98	99	96	98
District of Columbia	110010050	100	97	99	99	* 29	* 75	* 23	* 50
Calvert, MD	240090011	93	96	90	93	97	94	96	94
Charles, MD	240170010	90	96	98	95	100	98	98	99
Frederick, MD	240210037	99	94	98	97	96	96	94	96
Montgomery, MD	240313001	96	97	98	97	98	98	99	98
Prince George's, MD	240330030	96	97	95	96	89	94	96	93
Prince George's, MD	240338003	95	95	98	96	97	97	97	97
Prince George's, MD	240339991	93	92	96	94	92	93	93	94
Arlington, VA	510130020	99	99	100	99	99	99	99	99
Fairfax, VA	510590030	98	98	99	98	98	98	98	98
Loudoun, VA	511071005	90	99	100	96	100	100	97	99
Prince William, VA	511530009	100	99	96	98	100	98	100	99
* This data is below the data completeness requirement in 40 CFR part 50, appendix U.

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Table 2 in this document shows the fourth-highest maximum 8-hour average ozone concentrations for the Washington Area monitors in each of the years 2019 to 2023. Table 3 in this document shows the ozone DV for these same monitors based on the average of the fourth-highest maximum 8-hour average ozone concentrations for the 2019-2021, 2020-2022, and 2021-2023 3-year periods.

Table 2—Fourth-Highest 8-Hour Ozone Average Concentrations ( ppm ) in the Washington Area in Each Year From 2019 to 2023

Location	AQS site ID	2019	2020	2021	2022	2023
District of Columbia	110010041	0.062	0.054	0.064	0.059	0.058
District of Columbia	110010043	0.071	0.063	0.072	0.066	0.072
District of Columbia	110010050	0.067	0.063	0.069	* 0.051	* 0.046
Calvert, MD	240090011	0.058	0.054	0.062	0.058	0.066
Charles, MD	240170010	0.061	0.052	0.066	0.061	0.069
Frederick, MD	240210037	0.065	0.063	0.067	0.061	0.074
Montgomery, MD	240313001	0.062	0.059	0.068	0.063	0.068
Prince George's, MD	240330030	0.071	0.064	0.066	0.061	0.070
Prince George's, MD	240338003	0.065	0.060	0.070	0.064	0.073
Prince George's, MD	240339991	0.075	0.065	0.071	0.065	0.072
Arlington, VA	510130020	0.068	0.062	0.070	0.061	0.071
Fairfax, VA	510590030	0.070	0.057	0.068	0.062	0.073
Loudoun, VA	511071005	0.060	0.060	0.066	0.061	0.067
Prince William, VA	511530009	0.060	0.057	0.062	0.058	0.070
* This data is shown in EPA's AQS as incomplete.

Table 3—Ozone Design Values ( ppm ) for the Washington Area

Location	AQS site ID	2019-2021	2020-2022	2021-2023
District of Columbia	110010041	0.060	0.059	0.060
District of Columbia	110010043	0.068	0.067	0.070
District of Columbia	110010050	0.066	* 0.061	* 0.055
Calvert, MD	240090011	0.058	0.058	0.062
Charles, MD	240170010	0.059	0.059	0.065
Frederick, MD	240210037	0.065	0.063	0.067
Montgomery, MD	240313001	0.063	0.063	0.066
Prince George's, MD	240330030	0.067	0.063	0.065
Prince George's, MD	240338003	0.065	0.064	0.069
Prince George's, MD	240339991	0.070	0.067	0.069
Arlington, VA	510130020	0.066	0.064	0.067
Fairfax, VA	510590030	0.065	0.062	0.067
Loudoun, VA	511071005	0.062	0.062	0.064
Prince William, VA	511530009	0.059	0.059	0.063
* This data is shown in the EPA's AQS as incomplete.